Finding the Fourth Proportional to 3,679.56, 5,517.72 and 1,947.78

Step by Step Solution

1. Step 1: Write the proportion equation
   3,679.56 : 5,517.72 = 1,947.78 : x
2. Step 2: Convert to fraction form
   3,679.56/5,517.72 = 1,947.78/x
3. Step 3: Cross multiply
   3,679.56x = 5,517.72 × 1,947.78
4. Step 4: Simplify right side
   3,679.56x = 10,747,304.66
5. Step 5: Solve for x
   x = 10,747,304.66/3,679.56
6. Step 6: Final answer
   x = 2,920.81